DE102016104956A1 - Home appliance and method for operating a household appliance - Google Patents

Abstract

The invention relates to a domestic appliance (2, 2.1), comprising at least one electrical energy store (8) arranged to supply at least one consumer of the household appliance (2, 2.1) with electrical power, at least one control device (10, 10.1) with at least one control unit ( 12) arranged for controlling the power output to the consumer depending on a set power level, wherein for the operation of the consumer with a first power level, a first target operating time depending on a reference charging state of the electrical energy store (8) is predetermined, wherein the control device (10, 10.1) at least one detection unit (14) configured to detect the state of charge of the electrical energy store (8), the control device (10, 10.1) at least one determination unit (16) configured to determine the actual operating time based on the set first power level and the detected Ladez the controller (10, 10.1) comprises at least one comparison unit (18) arranged to compare the determined actual operating time and the first target operating time and the control unit (12) is adapted to effect a reduction of the power output by at least a first predetermined power reduction value, when the determined actual operating time is at least less than the first target operating time.

Description

The invention relates to a household appliance, comprising at least one electrical energy store configured to supply at least one consumer of the household appliance with electrical power, at least one control device having at least one control unit configured to control the power output to the consumer depending on a set power level, wherein for the operation of Consumer is specified with a first power level, a first target operating time dependent on a reference state of charge of the electrical energy storage. Moreover, the invention relates to a method for operating a household appliance and a computer program.

With electrically operated domestic appliances, energy sources increasingly use electrical energy stores in order to enable wireless operation and thus to increase user comfort. In particular, at least one electrical consumer of a domestic appliance can be supplied with electrical power by an electrical energy store. The power output is usually controlled by a control device. Depending on a set power level, the controller controls the power output to the at least one consumer.

The electrical energy store of a household appliance is designed in such a way that the electrical consumer of the household appliance has a set power level (eg, an operating power value P _B ) at a (nearly) maximum charge state for a predetermined target operating time (eg T _target = x min) yW) can be operated.

An exemplary household appliance in the form of a household cleaning appliance is a vacuum cleaner. The vacuum cleaner can have a base body and an accessory that can be connected to the base body, such as a suction unit or nozzle unit for cleaning surfaces. In particular, a suction device is arranged in the base body. The suction device has a working element in the form of a suction fan, which can be driven by an electrical load in the form of an electric motor. About the suction device can be sucked by a arranged between the suction device and the accessory suction channel particles that are located on the surface to be cleaned.

In such a vacuum cleaner can be provided that the accumulator is designed such that the electric motor can be operated at a set first power level and starting from a reference charging state with a predetermined target operating time. For example, with a set first maximum power level (eg P _B1 = 250 W) and a maximum charge state as a reference charging state, the electric motor can be operated with this power level for a first target operating time T _target = 10 min.

The problem with conventional household appliances is that the performance of the electrical energy store is reduced over the life of the household appliance. This deterioration also occurs when using lithium-ion batteries as energy storage. A corresponding reduction in power of the energy store has, in particular, the consequence that the above-mentioned desired operating time can no longer be achieved. In other words, the actual operating time is reduced compared to the predetermined target operating time. In the above example, the operating time can be reduced to T _B = 8 minutes and less under the same conditions. The reduced operating time in turn results in a reduced user comfort.

To solve this problem, it is known from the prior art to install energy storage with a larger capacity in household appliances, as it is required to achieve the predetermined target operating time. Thus, in this known solution initially not the entire capacity of the built-in energy storage is retrieved. With increasing lifetime and in particular with increasing charging and Entladezyklenzahl more and more capacity is provided and used by means of a control device gradually.

Although this can be achieved by the fact that in the course of the life of the household appliance, the predetermined target operating time is reached. A disadvantage of this solution, however, is that, for example, accumulators with larger capacity increase the weight of the household appliance, require larger space and also increase the cost of the household appliance.

Therefore, the invention has for its object to provide a household appliance, which at least reduces the disadvantages of the known household appliances and in particular improves the user comfort of the household appliance in a simple manner.

This object is achieved according to a first aspect by a household appliance according to claim 1. The household appliance comprises at least one electrical energy store configured to supply at least one consumer of the household appliance with electrical power. The household appliance comprises at least one control device with at least one control unit configured to control the Power output to the consumer depending on a set power level. For the operation of the consumer with a first power level, a first desired operating time is predetermined as a function of a reference charging state of the electrical energy store. The control device comprises at least one detection unit configured to detect the state of charge of the electrical energy store. The control device comprises at least one determining unit configured to determine the actual operating time based on the set first power level and the detected state of charge. The control device comprises at least one comparison unit configured to compare the determined actual operation time and the first target operation time. The control unit is arranged to effect a reduction of the power output to the load by at least a first predetermined power reduction value if the determined actual operating time is at least less than the first target operating time.

In contrast to the prior art, the power delivered to the at least one consumer is reduced upon detection that the predetermined target operating time in a certain power level will not be achieved, the desired and predetermined target operating time can be achieved and thus the operating comfort for the user is improved become. In particular, it is possible to dispense with the implementation of an energy store with a larger capacity. In a simple, cost-effective and space-saving manner, a domestic appliance is provided in which the predetermined desired operating time is reached even after a large number of charging and discharging cycles (eg> 250).

Exemplary and non-completing household appliances are household cleaning appliances, kitchen appliances and household tools. The household appliance comprises at least one (rechargeable) electrical energy store. A rechargeable energy storage is set up to store electrical energy and, if necessary, to at least one electrical consumer. Preferably, a rechargeable electrical energy storage in the form of a rechargeable battery, such as a lithium-ion battery is provided.

In addition, the household appliance has at least one electrical consumer, such as an electric motor. The consumer can be operated with at least one power level, preferably with a plurality of different power levels. For the at least one power level, an operating power value can be specified. Depending on the set power level controls a control unit of a control device, the power output to the consumer. In particular, a power corresponding to the operating power value of the set power level is supplied to the load.

In this case, a first nominal operating time is predetermined for a first power stage. For at least one further power level, a further desired operating time can be predetermined. A target operating time indicates the time at which the at least one consumer is to be operated starting from a reference charging state with a specific power level. In the present case, the reference charging state is in particular the maximum charging state. A target operating time is therefore in particular the maximum operating time of the at least one consumer, in particular of the household appliance, based on the set power level.

In order to achieve the target operating time even after an aging of an electrical energy store, it is provided that the actual operating time that is achieved during the (energy storage) operation of the household appliance based on a detected (current) state of charge of the electrical energy store and the (instantaneous) power level can, is determined.

For detecting the state of charge, a detection unit is provided. The detection unit can be set up, for example, to carry out a chemical, voltage-dependent, current-integrative, pressure-dependent and / or energy storage impedance measurement.

The determined actual operating time is compared with the first target operating time. It is understood that the already expired operating time can be taken into account for carrying out the comparison. For example, the actual remaining operating time can be compared with the remaining first target operating time.

If the determined actual operating time is greater than or substantially equal to the first setpoint operating time, the at least one load is supplied with unchanged power, in particular with an unchanged operating power value.

If, on the other hand, it is detected that the determined actual operating time is at least less than the first desired operating time, the control unit effects a reduction of the power output to the electrical load from the electrical energy store by at least a first predetermined power reduction value. In other words, upon detection of a negative deviation, which occurs in particular when the determined actual operating time is less than the first target operating time, the output power is reduced by the control unit. It is understood that according to one embodiment, this deviation is a predefinable Minimum value to cause a reduction in performance.

During operation of the household appliance in a power level, two or more consumers of the household appliance can be supplied with power from the electrical energy store. In this case, it may be provided that the operating power value is reduced by only one or more consumers by the control device. If the operating power value is reduced in the case of several consumers, a first (individual) power reduction value can preferably be predetermined for each consumer.

According to a first embodiment of the household appliance according to the invention, the control unit may be configured to reduce the power output by the first power reduction value at the earliest after the expiration of a first predetermined operating period of the consumer. For example, the control device may have a timer, which starts to run at the start of the operation of the household appliance with a set power level. At the earliest after detection of the expiry of the first predetermined operating period, a reduction of the power can be effected. For example, after the first predetermined operating time has expired, the actual operating time can first be determined and the above comparison can be carried out. It is understood that these two steps can be performed at least partially before the end of the first predetermined operating period. As a result, an immediate and unwanted power reduction during operation of the household appliance is avoided. It is particularly preferred if the first predetermined operating time depends on the first target operating time. Preferably, the first predetermined operating time between 30% and 70% of the first target operating time, preferably between 40% and 60% of the first target operating time, lie.

It can be provided that the detection unit detects the state of charge at specific times and makes it available to the determination unit. Preferably, the detection unit for substantially continuously detecting the state of charge of the electrical energy storage device can be set up. This ensures that at any time the current or current state of charge of the electrical energy storage is available.

Further, it has been recognized that to enhance user comfort, performance should, if required, be reduced such that the power reduction by the user remains (almost) unnoticed. According to a preferred embodiment of the household appliance, the first predetermined power reduction value may be between 1% and 10% of the operating power value of the adjusted power level, preferably between 3% and 7% of the operating power value of the set power level. Especially with a first power reduction value of less than 7%, the power reduction is hardly noticeable to the user of the household appliance. In a household appliance in the form of a vacuum cleaner, for example, the cleaning result is obtained subjectively. In addition, the engine speed changes barely at a corresponding power reduction in a consumer designed as an electric motor.

In particular, in a preferred embodiment, the reduction of the power can not be done immediately (in one step) by the power reduction value, but in a stepwise manner, in particular continuously over a predeterminable time period. An abrupt change in performance can be avoided.

In a further embodiment of the household appliance, it may be provided that, after a reduction in the power output, the determining unit is configured to (re) determine the actual operating time based on the reduced operating power value and the (currently) detected charging state. The comparison unit may be configured to compare the newly determined actual operation time and the first target operation time. In other words, after a reduction in the power delivered to the consumer, it is possible to check whether the desired set operating time can be achieved by changing the output power. If this is the case, the consumer continues to operate unchanged with the reduced power, ie the reduced operating power value.

Furthermore, the control unit may be configured to effect a reduction of the power output by at least one further predetermined power reduction value if the newly determined actual operating time is at least less than the first setpoint operating time. Thus, if it is determined that the power reduction made is insufficient to reach the first target operating time (actual operating time <target operating time), a further reduction of the power output to the load can be effected. In a corresponding, iterative manner, the output power can be gradually reduced in one embodiment of the household appliance until the setpoint time is reached again.

According to a preferred embodiment, the control unit may be configured to reduce the power at the first power level only up to a maximum predetermined total power reduction value. Too strong Achievement reduction and thus, for example, accompanying excessive suction power reduction, in which no adequate cleaning by a vacuum cleaner is possible to avoid, a corresponding limit can be specified.

Furthermore, according to a further embodiment, it may be provided that the control unit is set up to reduce the power output by the further predetermined power reduction value at the earliest after expiry of a further predetermined operating period of the load.

Moreover, according to an embodiment of the household appliance, the control device may comprise at least one arithmetic unit configured to calculate a power reduction value as the first power reduction value, the calculated power reduction value being adapted to reduce the power output such that the first target operation time is achieved. Instead of a step-by-step reduction by predetermined power reduction values, the first power reduction value required to achieve the first target operating time can also be calculated (almost exactly) as an alternative. This can be done based on the deviation detected between the actual operating time and the desired operating time by the comparison operation. Then, the controller may effect a reduction in power by the calculated power reduction value. It is understood that also in this embodiment, after the reduction of the power according to the above embodiment, a check can be made as to whether the first target operation time is actually reached.

Preferably, the control device can set up at least one memory unit for storing the first target operating time, the first reference charging state (eg maximum charging state), the first predetermined operating time, the further predetermined operating time, the first power reduction value, the further power reduction value and / or the total power reduction value at least for the first adjustable power level. By preferably storing all of this data in a memory unit, it can be easily checked whether a power reduction is required. And if required, the power reduction can be performed in a simple and defined manner by reading out and applying the corresponding power reduction value. In particular, all of these data are stored in particular for all adjustable power levels. The control unit can then read and, in particular, apply the desired data from the memory unit, depending on the set (instantaneous) power level.

According to a further embodiment, the household appliance may be a household cleaning appliance. The household cleaning appliance may in particular be a vacuum cleaner. The household cleaning appliance may comprise a body, to the z. B. one or more (different) accessories / e are at least coupled. An accessory is in particular a coupling accessory. The at least one accessory can preferably be an active accessory (eg active nozzle) or a passive accessory (eg passive nozzle and / or an extension hose with handling handle). An active accessory has at least one electrical load, such as an electrically operated sensor and / or an electrically operated actuator. An actuator may be, for example, an electric motor for operating a working element of the household cleaning appliance or for operating a working element of the accessory. A passive accessory, however, does not include any electrical consumers.

• – Bestimmen der tatsächlichen Betriebszeit in Abhängigkeit eines erfassten Ladezustands des elektrischen Energiespeichers und der eingestellten ersten Leistungsstufe,
• – Vergleichen der bestimmten tatsächlichen Betriebszeit mit der ersten Sollbetriebszeit, und
• – Bewirken einer Reduktion der Leistungsabgabe um einen vorgegebenen ersten Leistungsreduktionswert, wenn die bestimmte tatsächliche Betriebszeit zumindest geringer ist als die erste Sollbetriebszeit.

Another aspect of the invention is a method for operating a household appliance, in particular a household appliance described above, wherein the household appliance comprises at least one electrical energy storage device configured to supply at least one consumer, wherein for the operation of the consumer with a first power level, a first target operating time dependent a reference state of charge of the electrical energy store is predetermined, the method comprising:

• Determining the actual operating time as a function of a detected charge state of the electrical energy store and the set first power level,
• Comparing the determined actual operating time with the first target operating time, and
• - causing a reduction of the power output by a predetermined first power reduction value when the determined actual operating time is at least less than the first target operating time.

Yet another aspect of the invention is a computer program having instructions executable on a processor such that a home appliance is operated in accordance with the method previously described.

The features of the methods and devices are freely combinable. In particular features of the description and / or the dependent claims, even in complete or partial circumvention of features of the independent claims, in isolation or freely combined with each other independently be inventive.

There are now a large number of possibilities for designing and further developing the household appliance according to the invention, the method according to the invention and the computer program according to the invention. For this purpose, reference is made, on the one hand, to the claims subordinate to the independent patent claims, and, on the other hand, to the description of exemplary embodiments in conjunction with the drawing. In the drawing shows:

1 a perspective view of a first embodiment of a household appliance according to the present invention,

2 a flowchart of an embodiment of a method according to the present invention, and

3 a perspective view of another embodiment of a household appliance according to the present invention.

Hereinafter, like reference numerals will be used for like elements.

The 1 shows a perspective view of a first embodiment of a household appliance in the form of a vacuum cleaner 2 according to the present invention. The vacuum cleaner 2 Can be operated wirelessly.

The vacuum cleaner 2 is for cleaning a surface, for. B. a floor 26 , set up. The vacuum cleaner 2 includes a main body 30 and one with the main body 30 connected accessories 4 , Accessories 4 is in the present example in the form of a passive accessory 4 educated. A passive accessory 4 does not include electrically operated consumers. The illustrated accessories 4 includes a passive work item 24 in the form of a bristle strip 24 and has wheels 22 ,

The main body 30 includes a suction device 28 with an internal working element in the form of a (not shown) suction fan. The suction fan is powered by an electric motor 6 driven. Furthermore, the suction device comprises 28 a recording 32 for a dust bag (not shown).

In addition, in the present embodiment, the main body 30 over a pole 34 with a handle 38 connected so that a user standing up the vacuum cleaner 2 can operate. The pole 34 is in particular a telescopic pole 34 , Via a main switch 36 a user can use the vacuum cleaner 2 activate. When activating the vacuum cleaner 2 in particular, the electric motor 6 energized to drive the suction fan.

The electrical power supply takes place here via a in the body 30 of the vacuum cleaner 2 installed rechargeable electric energy storage 8th ,

The power output from the electrical energy storage 8th to the electric motor 6 is controlled by a control device 10 controlled. The control device 10 has a correspondingly configured control unit for this purpose 12 on. Furthermore, the control device comprises 10 a detection unit 14 for the particular continuous detection or measurement of the state of charge of the electrical energy storage 8th ,

As can be seen, the control device comprises 10 also a determination unit 16 , a comparison unit 18 and a storage unit 20 ,

In the storage unit 20 are preferably all predetermined values / data stored. Preferably, the desired operating time can first be stored for each power stage in addition to the associated power. Furthermore, at least one first power reduction value can be stored at least for each power stage. In the event that two or more consumers are supplied with (different) power at one power level, a first (different) power reduction value can be stored for each of the consumers. Likewise, at least one first predetermined operating period can be stored for each power stage.

At least the control unit 12 and the comparison unit 18 can on the storage unit 20 access and the in the storage unit 20 apply deposited data.

The control device 10 may be formed by hardware (eg, processor, memory means, etc.) and / or software. The units 12 to 20 may be at least partially formed as separate modules or integrated in one element.

The following is the control of the power output to the electric motor 5 by the control device 10 with the help of 2 explained in more detail. The 2 shows a flowchart of an embodiment of a method according to the present invention.

In a first step 201 becomes the vacuum cleaner 2 activated by a user in a conventional manner. In particular, the user may set an operating mode or power level (eg, a maximum power level for maximum suction power or a low power consumption power level).

The control device 10 can detect the set power level and the control unit 12 the control device 10 can the associated operating power value P _B, for example, from the storage unit 20 read and apply. In the following example, it is assumed that a first power level is set at which the electric motor 6 is operated with a first operating power value of P _B1 = 250 W. Furthermore, for the first power stage, a first target operating time of z. B. T _set = 10 min predetermined, wherein the first target operating time is based on a specific reference charging state of the electrical energy storage 8th , The determined reference charging state is preferably the maximum charging state. In particular, the first target operating time therefore represents the time at which the electric motor 6 starting from a (nearly) maximum state of charge of the energy store 8th to be operated in the power level.

In step 201 In addition, the state of charge of the electrical energy store that is present during the activation is determined 8th from the detection unit 14 detected. It is understood that in the event that the state of charge does not correspond to the reference charging state, a first desired operating time adapted to the detected state of charge can be determined as a function of the state of charge detected during activation and the predetermined first operating time.

Preferably, from the activation of the vacuum cleaner 2 and during operation of the vacuum cleaner 2 the state of charge of the electrical energy storage 8th essentially continuously from the capture unit 14 detected.

In a next step 202 can be the destination unit 16 based on the current state of charge and the set power level or the corresponding operating power value (here P _B1 = 250 W) calculate the actual remaining operating time. In particular, the step 202 be performed only after a first predetermined period of operation. However, at least a possibly required power reduction (see step 204 ) be performed after a first predetermined period of operation.

The first predetermined operating time depends in particular on the first target operating time. The first predetermined operating time is preferably between 30% and 70% of the first set operating time, in particular between 40% and 60% of the first set operating time. In the present example, it is assumed that after a first predetermined operating time of T _D1 = 6 min, the actual target operating time is determined. It will be appreciated that the first predetermined operating period is based on a maximum output charge state.

In one step 203 is then from the comparison unit 18 the actual operating time compared with the first target operating time. For example, for this purpose, the actual remaining operating time can be compared with the remaining target operating time based on the elapsed operating time. It can also be provided that the remaining operating time is normalized to the total operating time and this value is compared with the target operating time.

In the present example, the remaining target operating time T _VSoll = 4 min. In the event that no deviation is detected during the comparison, ie the actual remaining operating time T _VB ≥ T _VSoll , the power output remains with the electric motor 6 unchanged. In one embodiment, the steps 202 and 203 be carried out again after a further predetermined operating time.

However, if the comparison result includes that the actual remaining operation time is at least smaller than the predetermined remaining operation time (eg, T _VB <T _VSoll ), the control unit causes 12 in step 204 a reduction in power by a predetermined first power reduction value. The first predetermined power reduction value depends in particular on the set power level. The first predetermined power reduction value may be between 1% and 10% of the operating power value of the adjusted power level, preferably between 3% and 7% of the operating power value of the adjusted power level. In the present example, the first power reduction value P _R1 = 10 W. In other words, the control unit 12 be set up, the power connected to the electric motor 6 is reduced to a reduced operating power value of P _RB = 240W.

In the optional steps 205 and 206 can be checked whether the power reduction made is sufficient to achieve the desired first target operating time. This can be done in step 205 according to the comments on step 202 the actual operating time will be determined again. For example, the re-determination can be carried out only after expiry of a further predetermined period of operation.

After comparing the re-determined operating time with the first target operating time in step 206 (see step 203 ), depending on the comparison result, the power output again from the control unit 12 be reduced (step 207 ). For this purpose, according to the comments on step 204 the control unit 12 the currently delivered power (eg P _RB = 240 W) by another predetermined Reduce power reduction value (eg P _R2 = 10 W).

In the event that the comparison unit 18 As a result, as a result of the previous reduction of the power, the actual operating time is now greater than or equal to the target operating time, the power output remains with the electric motor 6 unchanged. In one embodiment, the steps 205 and 206 be carried out again after a further predetermined operating time.

It is understood that after one (and each) further power reduction can be checked in optional further steps, if the power reduction made is sufficient to achieve the desired target operating time to possibly cause a further reduction in power. Preferably, however, a maximum total power reduction value can be predetermined in particular for each power stage, by which the power may be maximally reduced.

3 shows a perspective view of another embodiment of a household appliance in the form of a vacuum cleaner 2.1 according to the present invention.

The vacuum cleaner 2.1 includes an active accessory 4.1 which is attached to a basic body 30 of the vacuum cleaner 2.1 is appropriate. The illustrated accessories 4.1 in the form of a Saugpolierdüse comprises a wiper unit designed as a working element 42 , The wiper unit 42 includes a vibrating body 44 and a wipe carrier 46 , An electric motor 48 is for driving the wiper unit 42 intended. The electric motor 48 may be a vibrating or rotating movement of the wipe carrier 46 produce. The double arrow 50 exemplifies a linear movement of the vibrating body 44 on, with the wipe carrier 46 over the ground 26 is moved. During this movement, a moist or dry cleaning or polishing of the soil takes place 26 , In addition, can be next to the side of the oscillating body 44 suction channels 52 be arranged to absorb particles. A wipe is, for example, by means of Velcro fasteners on the wipe cloth carrier 46 detachably attached.

To the electrical power supply, the vacuum cleaner 2.1 a rechargeable electrical energy storage 8th on. It is understood that at least one other electrical energy storage, for example, in the accessories 4.1 can be arranged.

The electric motor 48 of active accessories 4.1 can over a line 56 and an electrical connector 54 with electrical power from the electrical energy storage 8th be supplied. The control of the power output to the electrical load, in this case the electric motors 6 and 48 , is from the controller 10.1 accepted.

In particular, the control unit 12 the control device 10.1 control the power output, among other things depending on the set power level. For example, there may be different levels of operation in which only the electric motor 6 of the basic body 30 or only the electric motor 48 of the accessories 4.1 or both electric motors 6 and 48 are activated.

The control device 10.1 of the 3 includes according to the control device 10 of the 1 Furthermore, a detection unit 14 , a determination unit 16 , a comparison unit 18 and a storage unit 20 , In contrast to the control device 10 according to the embodiment of the 1 has the control device 10.1 in the present case additionally an arithmetic unit 40 on.

First, according to the previous statements by the units 14 to 18 determines whether a predetermined target operating time can actually be achieved.

If this is not the case, the arithmetic unit determines 40 the at least one first power reduction value for reducing the power output. The first power reduction value is calculated such that it is sufficient to reach the desired target operating time after a power reduction by the calculated first power reduction value. Again, a maximum allowable power reduction value can be specified.

In the event that in a power stage the at least two electric motors 6 . 48 can be operated simultaneously, in the storage unit 20 Rules be deposited, as the required power reduction to the at least two electric motors 6 . 48 has to divide.

LIST OF REFERENCE NUMBERS

2, 2.1

vacuum cleaner

4, 4.1

equipment

6

electric motor

8th

electrical energy storage

10, 10.1

control device

12

control unit

14

acquisition unit

16

determining unit

18

comparing unit

20

storage unit

22

castors

24

bristle strips

26

ground

28

suction device

30

body

32

Dust bag receptacle

34

telescopic rod

36

main switch

38

handle

40

computer unit

42

wiper unit

44

oscillating body

46

Wipe carrier

48

electric motor

50

double arrow

52

suction channels

54

connector

56

management

Claims (13)

Household appliance ( 2 . 2.1 ), comprising: - at least one electrical energy store ( 8th ) arranged to supply at least one consumer of the household appliance ( 2 . 2.1 ) with electrical power, - at least one control device ( 10 . 10.1 ) with at least one control unit ( 12 ) arranged for controlling the power output to the consumer depending on a set power level, - for the operation of the consumer with a first power level, a first target operating time depending on a reference state of charge of the electrical energy storage ( 8th ), characterized in that - the control device ( 10 . 10.1 ) at least one registration unit ( 14 ) arranged to detect the state of charge of the electrical energy store ( 8th ), - the control device ( 10 . 10.1 ) at least one determination unit ( 16 ) configured to determine the actual operating time based on the adjusted first power level and the detected state of charge, 10 . 10.1 ) at least one comparison unit ( 18 ) arranged to compare the determined actual operating time and the first target operating time, and - the control unit ( 12 ) is arranged to cause a reduction of the power output by at least a first predetermined power reduction value when the determined actual operating time is at least less than the first target operating time. Household appliance ( 2 . 2.1 ) according to claim 1, characterized in that the control unit ( 12 ) is arranged to reduce the power output by the first power reduction value at the earliest after expiration of a first predetermined operating period of the consumer. Household appliance ( 2 . 2.1 ) according to claim 2, characterized in that the first predetermined operating time between 30% and 70% of the first target operating time, preferably between 40% and 60% of the first target operating time is. Household appliance ( 2 . 2.1 ) according to one of the preceding claims, characterized in that the detection unit ( 14 ) for substantially continuously detecting the state of charge of the electrical energy store ( 8th ) is set up. Household appliance ( 2 . 2.1 ) according to one of the preceding claims, characterized in that the first predetermined power reduction value is between 1% and 10% of the operating power value of the adjusted power level, preferably between 3% and 7% of the operating power value of the set power level. Household appliance ( 2 . 2.1 ) according to one of the preceding claims, characterized in that after a reduction of the power output - the determination unit ( 16 ) is set up to determine the actual operating time based on the reduced operating power value and the detected state of charge, - the comparison unit ( 18 ) is set up to compare the newly determined actual operating time and the first target operating time, and - the control unit ( 12 ) is arranged to effect a reduction of the power output by at least one further predetermined power reduction value if the re-determined operating time is at least less than the first target operating time. Household appliance ( 2 . 2.1 ) according to claim 6, characterized in that the control unit ( 12 ) is arranged to reduce the power output by the further predetermined power reduction value at the earliest after expiration of a further predetermined operating period of the consumer. Household appliance ( 2 . 2.1 ) according to one of the preceding claims, characterized in that the control unit ( 12 ) is adapted to reduce the power at the first power level only up to a maximum total power reduction value. Household appliance ( 2 . 2.1 ) according to claim 1, characterized in that - the control device ( 10 . 10.1 ) at least one arithmetic unit ( 40 ) configured to calculate a power reduction value as the first power reduction value, wherein the calculated power reduction value is adapted to reduce the power output such that the first target operation time is achieved. Household appliance ( 2 . 2.1 ) according to one of the preceding claims, characterized in that the control device ( 10 . 10.1 ) at least one storage unit ( 20 ) set up to save the first target operating time, the reference charging state, the first predetermined operating time, the further predetermined operating time, the first power reduction value, the further power reduction value and / or the total power reduction value at least for the first adjustable power level. Household appliance ( 2 . 2.1 ) according to one of the preceding claims, characterized in that the domestic appliance ( 2 . 2.1 ) a household cleaning device ( 2 . 2.1 ). Method for operating a household appliance ( 2 . 2.1 ), in particular a household appliance ( 2 . 2.1 ) according to one of the preceding claims, wherein the domestic appliance ( 2 . 2.1 ) at least one electrical energy store ( 8th ) arranged to supply at least one consumer, wherein for the operation of the consumer with a first power level, a first target operating time depending on a reference state of charge of the electrical energy storage ( 8th ), the method comprising: determining the actual operating time as a function of a detected state of charge of the electrical energy store ( 8th ) and the adjusted first power level, - comparing the determined actual operating time with the first target operating time, and - effecting a reduction of the power output by a predetermined first power reduction value when the determined actual operating time is at least less than the first target operating time. Computer program with instructions executable on a processor such that a household appliance ( 2 . 2.1 ) is operated according to the method of claim 11.

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